JP2508177B2 - Strip shape detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention enables accurate measurement of strip warpage occurring in the strip width direction by removing the influence of strip warpage occurring in the strip longitudinal direction. The present invention relates to a strip plate shape detecting device.

[Prior Art] A leveler has been conventionally used to correct the flatness of a strip after rolling. However, a plate subjected to flatness correction by a leveler has a plate warp in the plate width direction (hereinafter referred to as ""Cwarpage") may occur.

For this reason, conventionally, a strip plate whose straightness has been corrected by a leveler is cut by a cutting machine in a later step and appropriately sampled, C warpage of the sampled plate is measured, and the amount of reduction of the leveling roll is measured from the result. Adjustments are being made.

However, conventionally, board sampling, C warpage measurement,
Since the worker adjusts the C warp prevention roll, there is a problem that the work is difficult and the reliability and safety are poor.

Therefore, recently, various studies have been made to continuously detect the C-warp and automatically control the C-warp straightening roll of the leveler according to the value.

Thus, in order to automatically control the C-warp straightening roll to eliminate the C-warp, it is necessary to accurately measure the C-warp of the plate sent from the leveler.

On the other hand, immediately after leaving the leveler, the plate warp in the longitudinal direction of the strip (hereinafter referred to as “L warp”) is small, and the C warp caused by the influence of the L warp is also small. It is considered desirable to do it immediately after the leveler.

However, according to the experiments conducted by the inventor of the present application, it has been found that an accurate value cannot be obtained for the C-warp even if the C-warp is measured with the plate in a horizontal state because both ends bend due to its own weight.

[Problems to be solved by the invention] Immediately after leaving the leveler, the strip plate is oriented in the horizontal direction. Therefore, in order to detect the C warp in the vertical direction,
Deflector rolls are required. However, when the deflector roll is installed, there is a problem in that the strip is newly bent due to the bending of the deflector roll, and the C-warp of the strip increases due to the L-warp.

In view of the above situation, the present invention provides a deflector roll that changes the moving direction of the strip from horizontal to vertical or from vertical to horizontal when measuring the C-warp of the strip that moves in the vertical direction behind the level. The purpose is to reduce or eliminate the L warp applied to the plate so that the C warp is not affected by the L warp.

[Means for Solving the Problem] A first invention is to arrange a bending deflector roll for bending a strip on an upstream side in a strip traveling line so that a strip being fed on the traveling line can be wound. , On the downstream side of the traveling direction of the bending deflector roll strip, a bending-back deflector roll that gives a bending back to the direction opposite to the bending direction to the bending-provided strip, the strip being sent along the running line. Arranged so as to be wound around, the strip warp in the strip width direction at the strip vertical portion required position from the bending deflector roll to the strip bending deflector roll and the strip vertical portion required position on the downstream side of the strip bending deflector roll. The second invention is to provide a C-curve detector for detecting the bending of the bending deflector roll and the deflecting deflector roll of the first invention. It is composed of a roll and a small diameter roll.

[Operation] In the first aspect of the invention, the strip is given a bend by the bending deflector roll, and a bend back is given by the bend back deflector roll, and a warp in the width direction of the strip is detected after the bend back. In the invention, when the plate thickness of the strip is thin, bending and bending back are given by a small diameter roll,
When it is thick, the large-diameter roll imparts bending and bending back, and then the plate warp in the width direction of the strip is detected. Therefore, it becomes possible to measure the plate warp in the width direction of the strip without removing the influence of the warp in the longitudinal direction of the strip.

[Examples] Examples of the present invention will be described below with reference to the accompanying drawings.

1 to 3 show an embodiment of the present invention, in which 2 is a deflector roll disposed behind the leveler 1 for changing the moving direction of the strip 6 from a horizontal direction to a vertical direction, and 3 is a vertical downward direction. The bending deflector roll 4 changes the moving direction of the strip plate 6 moving vertically to the vertical upward direction, and the bending deflector roll 4 changes the moving direction of the strip plate 6 moving vertically upward to the vertical downward direction by bending the strip plate 6 in the direction opposite to the bending direction. The bend-back deflector rolls 5 are deflector rolls that change the moving direction of the strip plate 6 from the vertical downward direction to the horizontal direction. The deflector rolls 2, 3, 4, and 5 are directed from the upstream side to the downstream side of the strip plate 6 in the moving direction. Are sequentially arranged.

Intermediate position between the bend deflector roll 3 and the bend return deflector roll 4 and the bend return deflector roll 4
At an intermediate position between the deflector roll 5 and the deflector roll 5, the front side of the strip 6 moving vertically downward to the vertical upward and the front side of the strip 6 moving vertically upward to the vertical downward are required in the strip width direction. A plurality of C warp detectors 7a, 7b, 7c and 7a ', 7 at intervals.
b ', 7c' are provided respectively, and C warp detectors 7a, 7b, 7c and 7 are provided.
The detectors 7a, 7b, 7c and 7a 'detected by a', 7b ', 7c',
Distance from the tip of 7b ', 7c' to the surface of strip 6 ya, yb, yc and y
a ', yb', yc 'are sent to the arithmetic units 8 and 8'and C
It is configured so that the warp can be calculated.

C warp whose flatness is corrected by leveler 1 y ₁₂ ′ = y ₁ (where y ₁ is the C warp given by leveler 1 and y ₁₂ ′ is the C warp that appears on strip 6 on the exit side of leveler 1) Strip 6 is sent to the deflector roll 2 and changes its direction from the horizontal direction to the vertically downward direction, and the deflector roll 2 gives L warp to the strip 6 and is affected by the L warp and C of the strip 6 is affected. Warp y ₁₂ ′ is y
₁₂ '= a y ₁ + y _2. y ₂ is a C warp that occurs in the strip plate 6 in the deflector roll 2. In addition, C immediately after level 1
Even if the warp is measured, since the plate is horizontal, it is affected by its own weight, and the correct C warp cannot be measured.

Next, the strip plate 6 is bent 180 degrees by the bending deflector roll 3 to change its direction from the vertically downward direction to the vertically upward direction. Thus the strip 6 under the influence of L warpage due to bending deflector roll 3 C warpage of y ₃ is generated. At this time, generally, the deflector roll 2 and the bending deflector roll 3 have substantially the same diameter, so that the L warp caused by the deflector roll 2 is directly carried to the deflector roll 3. Therefore, the value of y ₂ is carried as it is as the C warp y ₃ . When the diameter of the bending deflector roll 3 is smaller than that of the deflector roll 2, y ₂ is replaced with y ₃ . Therefore, C of the strip plate 6 downstream of the bending deflector roll 3 is
The warp y ₁₃ ′ becomes y ₁₃ ′ ＝ y ₁ ＋ y ₃ . When the C warp detectors 7a, 7b, 7c are provided after the bending deflector roll 3,
Distances from the tips of detectors 7a, 7b, 7c to the surface of strip 6 ya, yb, yc
Is detected by the detectors 7a, 7b, 7c and sent to the arithmetic unit 8, where Therefore, C warpage is required.

The strip 6 is then subjected to the bending back by the bending back deflector roll 4, but if the diameters of the deflecting rolls 3 and 4 are equal, it is generated by the influence of the L warpage due to the bending back to cause C.
The warp is -y ₃ . Therefore, the C warp y ₁₄ ′ at the intermediate portion between the deflecting deflector roll 4 and the deflector roll 5
Becomes y ₁₄ ′ ＝ y ₁ −y ₃ . Since the C-warp y ₁₄ ′ becomes apparent in the vertical portion, the C-warp y ₁₄ ′ is detected at this position.

That is, the distances ya ', yb', yc 'from the tips of the detectors 7a', 7b ', 7c' detected by the C-curve detectors 7a ', 7b', 7c 'to the surface of the strip plate 6 are calculated by the arithmetic unit 8 Sent to Thus, the C warp y ₁₄ ′ is obtained. The C warps y ₁₃ ′ and y ₁₄ ′ obtained by the arithmetic units 8 and 8 ′ are given to the arithmetic unit 9.
Taking the average of y ₁₃ ′ and y ₁₄ ′, Therefore, the C warp y ₁ after leaving the level 1 is calculated. That is, the equivalent C warpage of the Y warp of y ₃ is canceled by each other. This C warp y ₁ is given to the leveler 1 as a command signal.

In the case of FIG. 1, when the diameter of the bending deflector roll 3 is small, the longitudinal plastic bending of the strip plate 6 is strongly performed, so that the influence of the L warp of the deflector roll 2 is eliminated and the bending deflector roll 3 is bent. C warpage occurs due to the influence of L warpage. This C-warp is determined only by the L-warp of the bending deflector roll 3 and the tension of the strip regardless of the degree of L-warp up to that point. This also applies to the case of the bending back deflector roll 4.

However, when the diameter of the bending deflector roll 3 is large, the plastic bending of the strip plate 6 by the bending deflector roll 3 is small, and the influence of y ₂ remains on y ₃ . Therefore, C of the strip 6
In order to cancel the y ₃ with each other by the warp y ₁₃ ′ and y ₁₄ ′, the deflector rolls 3 and 4 have a small diameter. When the strip plate 6 has a large thickness, the diameters of the deflector rolls 3 and 4 are relatively smaller than the plate thickness. Therefore, even if the deflector rolls 3 and 4 are not made small in diameter, the C warp y _{3 is set} to y ₁₃ ′. You can cancel the measurement with y ₁₄ ′ and measure.

FIG. 4 shows another embodiment of the present invention. In the above embodiment, the bending deflector roll 4 is arranged almost directly above the bending deflector roll 3, but in this embodiment, the bending deflector roll 3 and the bending deflector deflector are arranged. A deflector roll 10 is disposed between the rolls 4 substantially directly above the bending deflector roll 3 and substantially horizontal to the deflecting deflector roll 4, and the bending angle of the deflecting deflector roll 3 and the deflecting deflector roll 4 is set. Is an example of 90 degrees instead of 180 degrees. Even with such a configuration, it is possible to measure the C-warp without the influence of the L-warp, as in the above-described embodiment.

FIG. 5 shows still another embodiment of the present invention, in which the bending deflector roll 3 and the bending return deflector roll 4 can be switched according to the thickness of the strip plate 6.

The bending deflector roll 3 and the bending return deflector roll 4 are provided with large-diameter rolls 3a, 4a and small-diameter rolls 3b, 4b, respectively.
The large-diameter rolls 3a, 4a and the small-diameter rolls 3b, 4b are pivotally supported by frames 3d, 4d which can rotate about pins 3c, 4c. In the figure, reference numeral 10 is a deflector roll that changes the direction of the strip plate 6 that has moved vertically upward from the bending deflector roll 3 and changes the direction of the strip plate 6 toward the deflector roll 4 in the horizontal direction.

When the strip plate 6 is thick, the strip plate 6 has a large diameter roll.
Bending is given by 3a, and turning back is given by the large diameter roll 4a, and when it is thin, rolls are switched, bending is given by the small diameter roll 3b, and bending turning is given by the small diameter roll 4b. By doing so, it is possible to measure the C warp without removing the influence of the L warp when the strip plate 6 is thick and when the strip plate 6 is thin.

Next, in the present embodiment, the reason why the large-diameter rolls 3a and 4a are used when the strip plate 6 is thick and the small-diameter rolls 3b and 4b are used when the strip plate 6 is thin will be described. .

In order to obtain the C-warp of the strip, it is necessary to give some plastic bending at the time of giving the first bending and bending back, but if the strain of the strip due to this plastic bending is too large, it will remain strongly in the strip. However, even if I try to correct it with a leveler in a later process, it cannot be fixed and I feel sick.

Generally, the surface strain ε ₃ due to plastic bending of a plate is ε ₃ ≈h /
Given in 2R. Here, h is the plate thickness, and R is the radius of the roll that imparts plastic bending to the plate.

Therefore, it is desirable that the strain ε _{3 be} larger than the plastic yield strain ε _y3 and smaller than the strain ε _{p that} does not have a strong adverse effect on the plate of the final product. Therefore, if the plastic bending strain to be applied to the strip is ε _c3 , is necessary. Here, R _c is a radius (roll radius) of the bending deflector roll 3 and the bending back deflecting roll 4.

Also, from equation (i), Therefore, ε _p and ε _y3 are specifically determined by operation experiments and the like.

Furthermore, from equation (ii) Since ε _y3 and ε _p are constants, it can be understood from the equation (iii) that the roll radius R _c for giving bending and bending back should take a size corresponding to the plate thickness h. That is, when the plate thickness h is large, a large roll radius is set to the plate thickness h.
It turns out that a small roll radius should be used when is small.

Further, C warpage y caused by bending or bending back by the bending deflector roll 3 and the bending back deflector roll 4 occurs in a form proportional to the plastic bending strain ε _c3 . This can also be said to be y∝ε _c3 or y = βε _c3 . Here, β is a proportional constant and has a complicated characteristic, and is generally given by an experiment or the like.

From the above, when the strip plate 6 is thick, the bending deflector roll 3 and the bending back deflector roll 4 are large-diameter rolls 3a and 4a, and when the strip plate 6 is thin, the bending deflector roll 3 and the bending back deflector are formed. It is preferable that the roll 4 is the small diameter rolls 3b and 4b.

In the embodiment of FIG. 5, when the small diameter roll is used, first the small diameter roll 3b and the large diameter roll 4a are used for bending and re-bending, and the C warp detectors 7a ', 7b', 7c are used for detection. Based on the data, the C warp y ₁₃ ′ was measured, and then the bending-reversing deflector roll 4 was switched to perform the bending-reversing with the small-diameter roll 4b (in this case, the bending deflector roll 3 was either a small-diameter roll or a large-diameter roll). Good), C warp detector 7a ′, 7
b ', 7c''were measured, the secondary time of y _13' C warping y ₁₄ based the data detected by the y ₁₄ 'and Calculate y ₁ by averaging. Therefore, in this case, only the C warp detectors 7a ', 7b', 7c 'are required. y ₁₃ ′
The arithmetic unit 9 averages y ₁₄ ′.

The present invention is not limited to the above-described embodiment, and the bend-back deflector roll may be arranged below the bend-deflector roll, and other various changes may be made without departing from the scope of the present invention. Of course, it can be added.

EFFECTS OF THE INVENTION According to the strip plate shape detection device of the present invention, the plate warp generated in the strip plate width direction can be measured without being affected by the plate warp generated in the strip plate longitudinal direction. It is possible to accurately measure the warp that occurs in the strip, and it is also possible to measure the plate warp that occurs in the width direction of the strip between the bending roll and the bending back roll, and further bend and bend back with the deflector roll. Since various advantages are provided, the device configuration can be simplified.

[Brief description of drawings]

FIG. 1 is an explanatory view of an embodiment of the strip shape detecting device of the present invention, FIGS. 2 and 3 are detailed views of the C-curve detector part of the device of FIG. 1, and FIG. 4 is the present invention. FIG. 5 is an explanatory view of another embodiment of the strip plate shape detection device of FIG. 5, and FIG. 5 is an explanatory view of still another example of the strip plate shape detection device of the present invention. In the figure, 3 is a bending deflector roll, 4 is a bending back deflecting roll, 3a and 4a are large diameter rolls, 3b and 4b are small diameter rolls,
Reference numerals 7a, 7b, 7c, 7a ', 7b' and 7c 'denote C warp detectors.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroyuki Shiozaki, No. 1 Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Ishikawajima Harima Heavy Industries, Ltd. Yokohama second factory (56) Reference JP-A 1-210812 (JP, A) )

Claims (2)

(57) [Claims] 1. A bending deflector roll for bending a strip on the upstream side in the strip traveling line is arranged so that the strip being fed on the traveling line is wound around the strip, and the strip deflecting roll travel direction. On the downstream side, a bend-reflective deflector roll that gives a bend-reversal to the bend-provided strip in a direction opposite to the bending direction is arranged so that the strip sent along the traveling line can be wound around the strip. C warp detectors for detecting the warp of the strip in the strip width direction are provided at the required positions of the strip vertical portion from the deflector roll to the deflector roll and at the strip vertical portion on the downstream side of the deflector deflector roll. A strip shape detecting device characterized by the above. 2. The strip shape detecting device according to claim 1, wherein each of the bending deflector roll and the bending back deflecting roll is constituted by a large diameter roll and a small diameter roll which can be switched.